<!DOCTYPE html>
<style>
  video {
    width: 95px;
    height: 95px;
  }
  #negative-margin {
    display: inline-block;
    width: 100px;
    height: 100px;
    background: green;
    margin-left: -100px;
  }
</style>
<video></video>
<div id="negative-margin"></div>
